Abstract
Simultaneous screening of 137Cs and 90Sr/90Y levels in coloured water samples by Liquid Scintillation Counter Quantulus 1220 via Cherenkov counting has been investigated. Ionic liquid 1-butyl-3-methylimidazolium salicylate with wavelength-shifting properties has been added to the counting vials, which significantly improved detection efficiency. The results of 137Cs activities obtained via LSC method have been compared with conventional gamma-spectrometric measurements. The performance and limitations of the method have been demonstrated on coloured samples spiked with known 137Cs and 90Sr/90Y activities. In the case of a nuclear accident, this method can be used without sample pre-treatment so that results are obtained within 2 h. The method provides results with up to 80% relative deviation from true 137Cs and 90Sr/90Y activities in the case of highly quenched samples. Its application is limited to the prompt screening of a larger number of samples when it is necessary to efficiently detect radioactive contamination of water.
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